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Date:      Sat, 17 May 2003 11:39:23 -0700
From:      Lars Eggert <larse@ISI.EDU>
To:        Brett Glass <brett@lariat.org>
Cc:        net@FreeBSD.org
Subject:   Re: Ping results are sometimes wrong
Message-ID:  <3EC681DB.1050109@isi.edu>
In-Reply-To: <200305171831.MAA17776@lariat.org>
References:  <200305171831.MAA17776@lariat.org>
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[-- Attachment #1 --]
Brett Glass wrote:

>>You could have the same problem when pinging through a router that
>>doesn't have the MAC address of the target, and ping doesn't have a way
>>to check that.  It would be simpler to just ignore the first sample when
>>calculating the statistics.
> 
> Or just throw away one ping altogether. Perhaps this is something that
> could be added to the program.

Various link layers have different characteristics. Trying to optimize 
the averaging algorithm based on the specific behavior of one particular 
link layer is probably not useful for a network layer tool like ping.

If you are pinging in the LAN where this overhead matters, you might 
consider using arping from ports instead.

Lars
-- 
Lars Eggert <larse@isi.edu>           USC Information Sciences Institute

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